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An increase in the price of tea from Rs. 40 per pound to Rs. 50 per pound increase the demand for coffee from 500 pounds to 600 pounds. The cross elasticity of demand is

An increase in the price of tea from Rs. 40 per pound to Rs. 50 per pound increase the demand for coffee from 500 pounds to 600 pounds. The cross elasticity of demand is Correct Answer $$\frac{4}{5}$$

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Study information given and select valid conclusion/s from the given statements based on it. In a joint family the number of members who take only coffee is equal to the half the number of members who take tea and the number of persons who take only tea is equal to the half the number of persons who take coffee. Statements: a. The total number of persons who take either coffee or tea or both is thrice the number of persons who take only coffee or only tea. b. The total number of persons who take only coffee and those who take only tea is twice the number of persons who take both coffee and tea.
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A set of 4 sentences (A, B, C and D in the same order) have been given in the above question followed by five option choices. From the option choice provided look for the option choice that acts as the fifth sentence (conclusion) for the statements mentioned. A. Britain’s first taste of tea was belated — the Chinese had been drinking it for 2,000 years.   B. The English diarist, Samuel Pepys, mentions tea in his diary entry from September 25, 1600. C. “Tcha”, wrote Pepys, the excellent and by all Physicians approved, China drink, was sold in England from 1635, for prices as high as £6 to £10 per pound of the herb (£600 to £1,000, today). D. In 1662, when King Charles II married the Portuguese princess, Catherine of Braganza, her dowry constituted a chest of tea, and the island of Bombay for an annual lease of £10, equivalent then to the cost of a pound of tea in England.